/*
 * Copyright (C) 2013 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#ifndef StringHashDumpContext_h
#define StringHashDumpContext_h

#include "HashMap.h"
#include "SixCharacterHash.h"
#include "StdLibExtras.h"
#include "StringPrintStream.h"
#include "text/CString.h"

namespace WTF {

    template<typename T>
    class StringHashDumpContext {
    public:
        StringHashDumpContext() {}

        CString getID(const T *value) {
            typename HashMap<const T *, CString>::iterator iter = m_forwardMap.find(value);
            if (iter != m_forwardMap.end())
                return iter->value;

            for (unsigned hashValue = toCString(*value).hash();; hashValue++) {
                CString fullHash = integerToSixCharacterHashString(hashValue).data();

                for (unsigned length = 2; length < 6; ++length) {
                    CString shortHash = CString(fullHash.data(), length);
                    if (!m_backwardMap.contains(shortHash)) {
                        m_forwardMap.add(value, shortHash);
                        m_backwardMap.add(shortHash, value);
                        return shortHash;
                    }
                }
            }
        }

        void dumpBrief(const T *value, PrintStream &out) {
            value->dumpBrief(out, getID(value));
        }

        CString brief(const T *value) {
            StringPrintStream out;
            dumpBrief(value, out);
            return out.toCString();
        }

        bool isEmpty() const { return m_forwardMap.isEmpty(); }

        void dump(PrintStream &out, const char *prefix = "") const {
            out.print(prefix);
            T::dumpContextHeader(out);
            out.print("\n");

            Vector<CString> keys;
            unsigned maxKeySize = 0;
            for (
                    typename HashMap<CString, const T *>::const_iterator iter = m_backwardMap.begin();
                    iter != m_backwardMap.end();
                    ++iter) {
                keys.append(iter->key);
                maxKeySize = std::max(maxKeySize, static_cast<unsigned>(brief(iter->value, iter->key).length()));
            }

            std::sort(keys.begin(), keys.end());

            for (unsigned i = 0; i < keys.size(); ++i) {
                const T *value = m_backwardMap.get(keys[i]);
                out.print(prefix, "    ");
                CString briefString = brief(value, keys[i]);
                out.print(briefString);
                for (unsigned n = briefString.length(); n < maxKeySize; ++n)
                    out.print(" ");
                out.print(" = ", *value, "\n");
            }
        }

    public:
        static CString brief(const T *value, const CString &string) {
            StringPrintStream out;
            value->dumpBrief(out, string);
            return out.toCString();
        }

        HashMap<const T *, CString> m_forwardMap;
        HashMap<CString, const T *> m_backwardMap;
    };

} // namespace WTF

using WTF::StringHashDumpContext;

#endif // StringHashDumpContext_h

